Automation System
A disadvantage of Numerical Control (NC) is:

one operator is needed for each machine.
None of these
the tape and tape reader are not reliable
the computer is not reliable
the machine tool can easily overheat

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Automation System
Today, programmable controllers:

All of these
are more powerful then the first controllers on the market
None of these
are relatively low cost compared with the original digital equipment available for industrial control
can be cost effective even when replacing just a few relays

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Automation System
The SKETCHPAD system

All of these
None of these
is used for interactive Graphics
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is expensive because it is sophisticated and make demands on the power and resources of the computer.

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